Tri Mountain Estates Dam
Key Takeaway
Tri Mountain Estates Dam is classified as high hazard in Washington. It was completed in 1953 and is 73 years old. Its primary use is irrigation. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Length | 1,355 ft |
| Dam Type | Earth |
| Max Storage | 177 acre-ft |
| Normal Storage | 137 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 125 cfs |
| Year Completed | 1953 (73 years old) |
| NID ID | WA00103 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Tri-Mountain Estates LLC
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Tri Mountain Estates Dam?
Tri Mountain Estates Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Tri Mountain Estates Dam?
Tri Mountain Estates Dam is owned by Tri-Mountain Estates LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tri Mountain Estates Dam built?
Tri Mountain Estates Dam was completed in 1953, making it 73 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Tri Mountain Estates Dam?
Tri Mountain Estates Dam serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Tri Mountain Estates Dam last inspected?
Tri Mountain Estates Dam was last inspected on March 9, 2024. Inspection dates indicate when a formal review occurred, not the results of that inspection.